The best way is to get the Luas from Heuston station to Connolly Station. From there get a DART to Dún Laoghaire. The Luas and DART are both rail services. It is also possible to get buses to Dún...
There is no postcode for Swords - it is outside th epostal codes areas of Dublin and address are in the format Name House number / Name and street Swords, Co. Dublin
Ireland does not use postal codes. So when you are writing to the address, after the main part of the address, finish is with:
Kinsealy,
Co. Dublin,
Ireland.
Whatever you are sending will get...
its about a 2.5 to 3 hour drive depending on weather and wether or not you get stuck in traffic in dublin. Its not too bad though, mostly motorway the whole way